3Com Cable Modem External Getting Started Manual page 34

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HAPTER THERNET
8 Verify that there is a hardware address listed in the TCP/IP
Info screen.
If there is, click OK and close the TCP/IP Control Panel (click
File and scroll down to click Close).
If there is no hardware address listed in the TCP/IP Info
screen, you must reset the computer's Parameter RAM. To
do this, power off the Macintosh. With the power off,
simultaneously press and hold down the Command
(Apple), Option, P, and R keys on the keyboard. Keeping
those keys pressed, power on the Macintosh.
When the computer starts, you will hear the Apple chime.
Keep the keys pressed for at least three chimes, then
release the keys and allow the computer to start up. When
fully rebooted, ensure that all TCP/IP settings match those
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NSTALLATION